It was fireworks for the first family, as First Lady Michelle Obama and Second Lady Dr. Jill Biden hosted a concert to honor military families Saturday night, letting loose with Sasha, Malia, and Jill's grandchildren ahead of the official inauguration on Jan. 21. Singers Katy Perry and Usher and the cast of Glee performed at the Kids' Inaugural Concert, which took place on a National Day of Service. See all the fun from the Washington DC celebration now!